CN1340181A - Magneto-acoustic marker for electronic article surveillance having reduced size and high signal amplitude - Google Patents

Abstract

A resonator, having a width no larger than about 13 mm, for use in a marker containing a bias element which produces a bias magnetic field in a magnetomechanical electronic article surveillance system is produced from annealed ferromagnetic ribbon having a basic composition FeaCobNicSixByMz wherein a, b, c, x, y and z are in at%, wherein M is one or more glass formation promoting elements and/or one or more transition metals, and wherein 15 </= a </= 30, 6 </= b </= 18, 27 </= c </= 55, 0 </= x </= 10, 10 </= y </= 25, 0 </= z </= 5, 14 </= x+y+z </= 25, such that a+b+c+x+y+z = 100. The ferromagnetic ribbon is annealed in a magnetic flied oriented perpendicularly to the ribbon axis and/or while applying a tensile stress to the ribbon along the ribbon axis. Single resonator or multiple resonator assemblies can be formed by cutting elements from the annealed ribbon. If multiple resonators are formed, the elements are placed in registration. The resulting narrow (6mm wide) resonator has properties comparable to the properties of wider resonators, such as the conventional 12.7 mm wide resonator.

Description

Be used for the small size of electron device supervision and the magneto-acoustic marker of high signal wave amplitude

The background of invention technology

TECHNICAL FIELD OF THE INVENTION

The present invention relates to be used for the magneto-acoustic marker of electron device surveillance, also relate to the electron device surveillance of using such magneto-acoustic marker and the method for producing such magneto-acoustic marker.

The description of prior art and related application

Electron device monitors that the magneto-acoustic marker of (EAS) typically comprises elongated magnetostriction amorphous alloy ribbon, and it is to setover with magnetism method by adjacent magnetic semihard metal tape.

The typical case of such EAS concentrator marker requires: at the resonant frequency of the unanimity of certain bias-field, this frequency mainly is the resonator length by suitable selection, linear magnetic hysteresis loop decision, in order to avoid the interference of harmonic wave system, and by in the magnetic field vertical with the resonator major axis, making amorphous band annealing can obtain linear magnetic hysteresis loop; Resonant frequency is to the muting sensitivity of bias-field, the reliable inactivation of concentrator marker when removing bias-field; And when removing the deexcitation Driving Field, (preferably) high resonance sustainable sufficiently long time of wave amplitude.

Can select the such resonator of unbodied Fe-Co-Ni-Si-B alloy manufacturing, this alloy is annealed applying in the presence of the magnetic field vertical with tape spool and/or have when tape spool applies tension stress.Preferably volume to volume is annealed, and is several seconds temperature 300-420 ℃ typical anneal time.After this this band is cut into rectangular, has constituted resonator like this.Common unsettled U. S. application number 08/890612 (" the amorphous magnetostriction alloy and the method for annealing thereof of low cobalt content " G.Herzer) in application on July 9th, 1997, common unsettled U. S. application number 08/968653 (" a kind of method for annealing of amorphous band and electron device monitor concentrator marker " G.Herzer) with application on November 2nd, 1997, all describe such resonator, also described the physics and the general existing background technology that relate to magneto-acoustic marker.These two parts of applications all transfer same assignee (Vacuumschmelez GmbH) together with the application, and these two parts of common pending applications all are incorporated herein as a reference.

Typical EAS concentrator marker uses single resonance device, about 38 millimeters of its length, about 25 microns of thickness, about 12.7 millimeters or 6 millimeters with width.The general signal wave amplitude that produces of broad concentrator marker is the twice of narrow concentrator marker, still, more wishes narrower concentrator marker, because its size is smaller.Yet, the magnetostriction concentrator marker that uses the elongated magnetostriction ferromagnetic material band of two or multi-disc was described in United States Patent (USP) 4510490.In the concentrator marker of Miao Shuing, these bands are placed in the cover side by side therein.Point out that in this list of references the reason of using a plurality of resonator bands in this known concentrator marker is in order to make resonator (being its each multiple band) with different frequency resonance, therefore, to provide the concentrator marker of signal specific homogeneity.

The present invention briefly describes

An object of the present invention is to provide a kind of reduced size and do not have the magneto-acoustic marker of degrade performance.

More specifically, an object of the present invention is to provide a kind of magnetostrictive amorphous alloy, it can be added in the concentrator marker such in the magnetic mechanical surveillance, this alloy can be cut into rectangular soft magnetostriction band, apply or remove premagnetization field H and can make band activation or inactivation, under activation condition, this band can be excited by alternating magnetic field, so that have the vibration of mechanical resonance longitudinally, resonant frequency is F _r, after exciting, synchronous vibration is the wave amplitude of high signal.

Another object of the present invention provides a kind of like this alloy, and when wherein bias-field changed, resonant frequency just changed a little, but when the concentrator marker resonator when active state forwards inactivated state to, variation of resonant frequency is very big.

Another object of the present invention provides a kind of like this alloy, and when adding so a kind of alloy in the concentrator marker of magnetic mechanical surveillance, this alloy can not trigger the alarm in the harmonic wave surveillance.

Another object of the present invention provides a kind of concentrator marker that comprises such resonator, and makes the method be adapted at the concentrator marker that uses in the magnetic mechanical surveillance.

Last purpose of the present invention provides magnetic mechanical electron device surveillance, and it is to operate with the concentrator marker that resonator is arranged, and this resonator is made up of a kind of so amorphous magnetostriction alloy.

Adopt a kind of method of making magnetic-sound EAS concentrator marker can reach above-mentioned these purposes, in this method, the short rectangular pieces registration of the amorphous band that two (or multi-disc) is narrow is placed in the cover, two (multiple) resonators have been constituted, the respective resonant frequency of each resonator sheet drops in the pact ± 500Hz, preferably in ± 300Hz.Allow these sheets have identical length and width, identical composition and identical annealing in process just can reach this frequency range.Therefore, advantageously will downcut two (multi-discs) of (switching to identical length) continuously puts together.The resonance signal wave amplitude that a kind of like this magnetoelasticity concentrator marker of invention produces can be compared with the general magnetoelasticity concentrator marker of prior art double-width.

Sheet " registration " is placed and to be meant that if these sheets strict conformance not, these sheets also are a slice overlapping substantially placements on another sheet as used herein.In any case this term is intended to get rid of the arrangement arranged side by side as in the prior art.

For double resonator, selecting its iron content is favourable greater than Fe-Ni-Co-base alloy about 15%, less than about 30%, and this alloy is being annealed in the presence of the magnetic field of vertical and tape spool and/or when having along tension stress that tape spool applies.This alloy composition is when annealing like that as described above, and the double resonator that obtains has the suitable performance of using in the concentrator marker of electron device surveillance or identification systems, and this alloy composition general formula is as follows:

Fe _aCo _bNi _cSi _xB _yM _zA, b, c, x, y and z represent with atom % in the formula, and wherein M is that one or more promote glass generting element such as C, P, Ge, Nb, Ta and/or Mo, and/or one or more transition metal such as Cr and/or Mn, and wherein

15≤a≤30

6≤b≤18

27≤c≤55

0≤x≤10

10≤y≤25

0≤z≤5

14≤x＋y＋z≤25

And a+b+c+x+y+z=100.

In preferred embodiments, this resonator assembly is made up of two strap registrations, and the thickness of each strap is about 20-30 micron, the about 4-8 millimeter of width, and the about 35-40 millimeter of length.

The more accurate scope of following formula below using, can particularly advantageous mode realize purpose of the present invention:

20≤a≤28

6≤b≤14

40≤c≤55

0.5≤x≤5

12≤y≤18

0≤z≤2

15≤x＋y＋z≤20

And a+b+c+x+y+z=100.

The such examples of alloys that is particularly suitable for double resonator is as follows, about 6 millimeters of the width of this double resonator, and length is the 35-40 millimeter.The 3-9 alloy that tested suitable alloy is a Table I, i.e. Fe ₂₄Co _12.5Ni _45.5Si ₂B ₁₆, Fe ₂₄Co _12.5Ni _45.5Si ₂B ₁₇, Fe ₂₄Co ₁₃Ni _45.5Si _1.5B ₁₆, Fe ₂₄Co ₁₂Ni _46.5Si _1.5B ₁₆, Fe ₂₄Co _11.5Ni ₄₇Si _1.5B ₁₆, Fe ₂₄Co ₁₁Ni ₄₈Si ₁B ₁₆And Fe ₂₇Co ₁₀Ni ₄₅Si ₂B ₁₆In order to optimize at iron content is the content of silicon and boron in the composition of 24 atom %, has also tested other various compositions.These other composition example is Fe ₂₄Co _12.5Ni ₄₅Si _1.5B ₁₇, Fe ₂₄Co _12.5Ni ₄₅Si ₂B _16.5, Fe ₂₄Co _12.5Ni ₄₅Si _2.5B ₁₆, Fe ₂₄Co _11.5Ni _46.5Si _1.5B _16.5, Fe ₂₄Co _11.5Ni _46.5Si ₂B ₁₆And Fe ₂₄Co _11.5Ni _46.5Si _2.5B _15.5Similarly composition has also been tested, wherein boron content revised ± 1 atom % approximately (by above-mentioned various other alloys at the beginning), be cost with nickel content.If there is tension stress annealing, then to be lower than the composition of about 0.5-1 atom % be relatively more suitable to boron content.

Based on above-mentioned result of study, be Fe preferred the composition ₂₄Co _11.5Ni _46.5Si _1.5B _16.5, J _s=0.86T.

If iron content does not remain on 24 atom %, other particularly suitable composition is Fe ₂₅Co ₁₀Ni ₄₇Si ₂B ₁₆And Fe ₂₂Co ₁₀Ni ₅₀Si ₂B ₁₆At last, by mathematical analysis and other test figure of above-mentioned sample, can expect that following (with similar) alloy composition also is particularly suitable: Fe ₂₂Co _12.5Ni _47.5Si ₂B ₁₆, Fe ₂₄Co _10.5Ni ₄₈Si ₂B _15.5, Fe ₂₄Co _9.5Ni _49.5Si _1.5B _15.5And Fe ₂₄Co _8.5Ni ₅₁Si ₁B _16.5These alloys should be particularly suitable, because cobalt content further reduces, cobalt is the most expensive component in these alloys.

Based on above-mentioned result of study, even can derive accurate formula on experience, this formula still drops in the scope of the more general expression of listing above again.This more accurate formula is as follows:

Fe _24-rCo _12.5-wNi _45+r+v+1.5wSi _2+uB _{16.5-u-v-0.5w}R=-4 to 4 atom % in the formula, u=-1 to 1 atom %, v=-1 to 1 atom % and w=-1 to 4 atom %.

Use such alloy composition, for example with tape spool vertical orientated at least about the magnetic field of 800 oersteds and about 50-150 MPa tension stress in the presence of, the about 15-50 rice of employing annealing speed/minute, the continuous annealing (volume to volume method) of the about 300-400 of the annealing temperature ℃ magnetic-acoustic property that can obtain to be fit to.It all is linear reaching up to magnetic alloy in the ferromagnetic saturated magnetic field that this method for annealing obtains magnetic hysteresis loop.Therefore, when exciting in alternating magnetic field, in fact this material does not produce any harmonics, so do not trigger the warning horn of harmonic wave surveillance yet.

Preferably, the magnetic field that applies during annealing is basically perpendicular to the band plane, and its intensity is at least about 2000 oersteds.This causes the meticulous regional structure of its peak width less than tape thickness, and the resonance wave panel height at least 10% of general (transverse magnetic field) annealing zone of resonance wave amplitude ratio.

The saturation magnetostriction of particularly suitable alloy composition is 8-14ppm, and during according to the annealing of method as described above, the B-H loop of these sheets can constitute resonator assembly together, and B-H loop has effective anisotropy field H _kAbout 8-12 oersted.Such anisotropy field intensity is low as to occur the advantage of maximum resonance wave amplitude when being enough to be provided at bias-field less than about 8 oersteds, has so for example reduced the material cost of lift magnet, has also avoided the magnetic clamp.On the other hand, forward to when deactivating state from active state at the concentrator marker resonator, given magnetization field intensity changes, i.e. [dF/dH]＜750Hz/Oe, and resonant frequency Fr alters a great deal simultaneously, at least about 1.6Hz, such anisotropy field is high enough to make the resonant frequency of active resonator that small relatively variation is only arranged.

The alloy band that common multiple resonator identifier is optimized is not suitable for the concentrator marker of single resonance device, and vice versa.Yet,, might provide the annealed alloy that can be fit to list and double resonator band by suitable selection alloy composition and thermal treatment.Particularly suitable for this purpose alloy has the about 10-12ppm of saturation magnetostriction, and these annealed alloys are so annealed, so that the anisotropy field H of double resonator _kIt is about 9-11 oersted.Following formula is made the following changes and can particularly advantageous mode achieve this end:

22≤a≤26

8≤b≤14

44≤c≤52

0.5≤x≤5

12≤y≤18

0≤z≤2

15≤x＋y＋z≤20

Width be 6 millimeters, length be the list of 35-40 millimeter and/or double resonator to be particularly suitable for examples of alloys as follows.These alloys comprise 3-8 alloy in the table 1, i.e. Fe ₂₄Co _12.5Ni _45.5Si ₂B ₁₆, Fe ₂₄Co _12.5Ni _44.5Si ₂B ₁₇, Fe ₂₄Co ₁₃Ni _45.5Si _1.5B ₁₆, Fe ₂₄Co ₁₂Ni _46.5Si _1.5B ₁₆, Fe ₂₄Co _11.5Ni ₄₇Si _1.5B ₁₆And Fe ₂₄Co ₁₁Ni ₄₈Si ₁B ₁₆Following other composition also is particularly suitable for two and/or single resonance device:

Fe ₂₄Co ₁₃Ni _45.5Si _1.5B ₁₆, Fe ₂₄Co _12.5Ni ₄₅Si _1.5B ₁₇, Fe ₂₄Co _12.5Ni ₄₅Si ₂B _16.5, Fe ₂₄Co _12.5Ni ₄₅Si _12.5B ₁₆, Fe ₂₄Co _11.5Ni _46.5Si _1.5B _16.5, Fe ₂₄Co _11.5Ni _46.5Si ₂B ₁₆, Fe ₂₄Co _11.5Ni _46.5Si _2.5B _15.5, Fe ₂₄Co ₁₁Ni ₄₇Si ₁B ₁₆, Fe ₂₄Co _10.5Ni ₄₈Si ₂B _15.5, Fe ₂₄Co _9.5Ni _49.5Si _1.5B _15.5, Fe ₂₄Co _8.5Ni ₅₁Si ₁B _15.5And Fe ₂₅Co ₁₀Ni ₄₇Si ₂B ₁₆

Based on the above-mentioned examples of alloys that is particularly suitable for two and/or single resonance device, more accurate formula is:

Fe _24-rCo _12.5-wNi _45+r+v+1.5wSi _2+uB _{16.5-u-v-0.5w}R=-1 to 1 atom % in the formula, u=-1 to 1 atom %, v=-1 to 1 atom % and w=-1 to 4 atom %.

In order to obtain along the character of strip length unanimity, it is favourable adopting FEEDBACK CONTROL to anneal.For this reason, after band leaves stove, measure magnetic property (being magnetic hysteresis loop), and if the test parameters that obtains just regulate annealing parameter when departing from predetermined value.Preferably, by the tensile stress level that adjustment applies, promptly increase or reduce its tension force and can finish this adjusting to obtain desired magnetic property.This feedback system can compensate effectively forms the influence to magnetic property and magnetoelasticity character of variation, thickness fluctuation and annealing time and temperature departure.Consequently the character of annealing zone is extremely consistent, and reappearance is also fine, otherwise this band can be subjected to great fluctuation owing to above-mentioned influence.

For will be continuously with measurement result and the character of resonator associate, when characteristics fluctuation appearred in short resonator assembly, it was very important revising the demagnetization operational factors.As an example, when the anisotropy field of continuous band adds that the single resonance device sheet demagnetization field sum of twice remains on constant predetermined value, during the preferably about 8-12 oersted of this value, can reach the resonator character of the unanimity of double resonator.

In another embodiment of the invention, plural strap registration is arranged in multi-resmator, for example three resonators.The advantage of such multi-resmator is that it can produce even higher signal wave amplitude.When aforesaid annealing, it is as follows to produce the alloy composition general formula with many (the promptly at least three) resonator that is adapted in the electron device identification systems concentrator marker using character:

Fe _aCo _bNi _cSi _xB _yM _zA, b, c, x, y and z represent with atom % in the formula, and wherein M is that one or more promote elements that glass generate, for example C, P, Ge, Nb, Ta and/or Mo, and/or one or more transitional element, and for example Cr and/or Mn, and wherein

30≤a≤65

0≤b≤6

25≤c≤50

0≤x≤10

10≤y≤25

0≤z≤5

15≤x＋y＋z≤25

And a+b+c+x+y+z=100.

In preferred embodiments, use following formula during the annealing of following more accurate scope, to apply tension stress, can control the anisotropy of amorphous alloy ribbon:

45≤a≤65

0≤b≤6

25≤c≤50

0≤x≤10

10≤y≤25

0≤z≤5

15≤x＋y＋z≤25

This examples of alloys that is particularly suitable for three resonators of 6 millimeters of width and length 35-40 millimeter is:

Fe ₄₆Co ₂Ni ₃₅Si ₁B _15.5C _0.5And Fe ₅₁Co ₂Ni ₃₀Si ₁B _15.5C _0.5

The example that is particularly suitable for of the 6 mm wide resonator assemblies that are made of 4 resonator sheets (about 35-40 millimeters long) is to consist of Fe ₅₃Ni ₃₀Si ₁B _15.5C _0.5

Usually, following composition is preferred to optimizing silicon and boron content, the production stove that uses when adopting the method for annealing that uses vertical magnetic field and tension stress simultaneously for assignee (Vaccumschmelzer GmbH) also is best, and these alloys also are candidates likely for further reduction cobalt content.These are preferably formed is Fe ₂₄Co ₁₃Ni _45.5Si _1.5B ₁₆, Fe ₂₄Co _12.5Ni _45.5Si ₂B ₁₆, Fe ₂₄Co _12.5Ni ₄₅Si ₂B _16.5, Fe ₂₄Co _11.5Ni _46.5Si _1.5B _16.5, Fe ₂₄Co _10.5Ni ₄₈Si ₂B _15.5, Fe ₂₅Co ₁₀Ni ₄₇Si ₂B ₁₆, Fe ₂₄Co _9.5Ni _49.5Si _1.5B _15.5And Fe ₂₄Co _8.5Ni ₅₁Si ₁B _15.5

At last, should be noted that typically as ingot production result, the alloy that obtains in the reality can contain carbon, it is measured up to about 0.5 atom %, and correspondingly boron should reduce such amount.

Description of drawings

Figure 1A is the resonant frequency F that shows the single resonance device concentrator marker and the concentrator marker of two resonators with the present invention's combination _rWith the graph of a relation of bias-field H, described concentrator marker is made by identical band, and this band consists of Fe ₂₄Co _12.5Ni _45.5Si ₂B ₁₆, under 355 ℃, 25 meters/minute of speed and the about 80 MPa conditions of tensile strength, anneal.

Figure 1B shows single resonance device concentrator marker and the resonance wave amplitude A1 of the concentrator marker of two resonators with the present invention's combination and the graph of a relation of bias-field H, and described concentrator marker is made by identical band, and this band consists of Fe ₂₄Co _12.5Ni _45.5Si ₂B ₁₆, under 355 ℃, 25 meters/minute of speed and the about 80 MPa conditions of tensile strength, anneal.

Fig. 2 is the single resonance device of double resonator, 38 millimeters long of 38 millimeters long and the magnetic hysteresis loop separately of long band, and they have identical composition, and with the same terms embodiment illustrated in fig. 1 under anneal.

Fig. 3 A is the magneto-acoustic marker element exploded view that makes up and produce according to the principle of the invention, and it has narrow (6 millimeters) resonator sheet.

Fig. 3 B is the end-view of the magneto-acoustic marker of the present invention of Fig. 3 A demonstration.

Fig. 4 A is the exploded view with common magneto-acoustic marker of wide (12.7 millimeters) resonator sheet.

Fig. 4 B is the end-view of the common magneto-acoustic marker of Fig. 4 A demonstration

Fig. 5 is that resonance wave amplitude A1 is with exciting AC field frequencies range F and resonator assembly resonant frequency F in the magneto-acoustic marker that makes up and produce according to the principle of the invention _rThe variation diagram of difference.

Fig. 6 shows the wave amplitude of double resonator and the graph of a relation of stimulating frequency, this resonator is made up of two narrow (6 millimeters) resonator sheets of arranging the arrangement of resonator sheet registration side by side, two sheets have different alloy compositions respectively, therefore have different separately resonant frequencies in given bias-field.

Fig. 7 shows the wave amplitude of double resonator and the graph of a relation of stimulating frequency, this resonator is made up of two narrow (6 millimeters) resonator sheets of arranging the arrangement of resonator sheet registration side by side, two sheets have identical alloy composition (No. 2 alloys of this paper table 1) respectively, therefore in certain bias-field, has each identical self-resonant frequency, and, also shown the single resonance device curve of this alloy for reference.

Fig. 8 shows the wave amplitude of double resonator and the graph of a relation of stimulating frequency, this resonator is made up of two narrow (6 millimeters) resonator sheets of arranging the arrangement of resonator sheet registration side by side, two sheets have identical alloy composition (No. 3 alloys of this paper table 1) respectively, therefore in given bias-field, has each identical self-resonant frequency, and, also demonstrate the single resonance device curve of this alloy for reference.

Fig. 9 shows two kinds of alloys (single resonance device sheet) resonant frequency F separately _rWith the relation curve of bias-field H, these alloys are according to the principle of the invention annealing that is used for the double resonator assembly, and have different saturation magnetostriction constant λ respectively _s

Figure 10 explanation with basic vertical and be orientated with being with plane parallel with tape spool, promptly cross in the magnetic field of bandwidth usually laterally annealing compare, have the resonator formed in accordance with the principles of the present invention be basically perpendicular to tape spool and perpendicular to the magnetic field on band plane in the wave amplitude that reached during annealing increase.

The preferred embodiments of the invention

The preparation of alloy

The melt rapid quenching is formed in the amorphous metal alloy in the Fe-Co-Ni-Si-B scope, is the strip of typical 25 micron thickness.Table 1 is listed the representative instance of studying composition and basic magnetic matter thereof.This composition only is nominal, and each concentration and nominal value may have a deviation, and alloy can contain the impurity (typically can be up to about 1 atom % as carbon) of picture carbon and so on, and this is because due to fusion process and the material purity.

All foundry goods can make with the feed metal ingot of buying at least 3 kilograms of markets.The band that test is used is 6 mm wides (except No. 2 alloys that width is 12.7 millimeters), and they or direct pouring become its last width, and perhaps the band by broad is cut into its last width.These are with hard and toughness, and upper surface is glossy and some lower surface has less gloss.

Annealing

Allow the alloy band be rolled onto another volume and in a continuous manner this band is annealed, in stove, apply the magnetic field vertical with the belt length axle by stove from one.

According to prior art, this magnetic field and tape spool horizontal orientation promptly cross bandwidth, or in addition, magnetic field so is orientated, so that its fundamental component is vertical with the band plane.Above-mentioned common-a back technology is disclosed in the unsettled U. S. application number 08/890612, the advantage of this technology is the higher signal wave amplitude.(laterally with vertical) in both cases, the annealing field is vertical with long tape spool.

In 2.80 meters long yokes, produce magnetic field with permanent magnet.Its intensity is in test about 2.8 kilo-oersteds, and the orientation in this magnetic field is substantially perpendicular to the band plane, for " laterally " magnetic-field annealing provides about 1 kilo-oersted.

Although the annealing field of using its orientation to be basically perpendicular to predetermined band plane has obtained most of embodiment of providing below, most of conclusion also can be applicable to tested general " laterally " and anneals.

Under ambiance, anneal.The range of choice of annealing temperature is about 300-420 ℃.The annealing temperature lower limit is about 300 ℃, for the induced magnetism anisotropy, reduces the inherent stress of part generation and enough heat energy is provided, and this temperature is essential.Obtained upper annealing temperature by Curie temperature and Tc.Another upper annealing temperature is to be enough to be cut into short requirement of being with by the ductility of band after thermal treatment obtain.The highest annealing temperature preferably should be the minimum temperature that is lower than the material behavior temperature.Therefore, typically, upper annealing temperature is about 420 ℃.

The stove that test is used is about 2.40 meters, and heating region is about 1.80 meters, and band is subjected to above-mentioned annealing temperature and handles in stove.The about typically 5-30 rice of annealing speed/minute, it respectively corresponding to annealing time be 22 seconds with down to about 4 seconds.

This band by stove, for fear of owing to magnetic field makes the crooked and distortion of band to power and the moment of torsion that band application adds, can use the annealing stationary fixture support belt of elongation with straight line path.

Use can will be to be set the magnetic property tension feedback control method that reaches predetermined value (if suitably selecting alloy composition) anneal.This technology is at length disclosed in above-mentioned common unsettled U. S. application number 08/968653.

Test

The band of annealing is cut into the short-movie of typical 38 millimeters long.These samples (" sample " be meant single strap or several strap put together) are used for measuring magnetic hysteresis loop and magnetic-elastic performance.

In the sinusoidal curve field of about 30 oersted spike width of cloth, under frequency 60Hz, measured magnetic hysteresis loop.Anisotropy field is defined as the magnetic field H that magnetization reaches its saturation value _kFor the easy magnetizing axis that crosses bandwidth, the available formula H in transverse anisotropy field _k=2K _u/ J _sAssociate J in the formula with anisotropy constant _sBe saturation magnetization, K _uBe that magnetization vector rotates to perpendicular to the every volume unit energy needed of the direction of easy magnetizing axis from the direction that is parallel to easy magnetizing axis.Should be noted that H _kNot only depend on alloy composition and thermal treatment, and, also depend on length, width and the thickness of sample owing to the demagnetization effect.

Use excites the longitudinal resonance vibration at the tone pulse of the little alternating magnetic field of the resonant frequency vibration of about 18 oersteds of the spike width of cloth, has measured for example resonant frequency F _rThe function that changes along tape spool with the dc bias magnetic field H of stack with magnetic-acoustic performance of resonance wave amplitude A1 and so on.Pulse working time is about 1.6 milliseconds, and the time out between the pulse is about 18 milliseconds.

The resonant frequency of vertical mechanical vibration of elongation band is provided by following formula: $F_r=\frac{1}{2L}\sqrt{E_H/\mathrm{\&rho;}}$ L is a sample length in the formula, E _HBe the Young modulus in bias-field H, and ρ is a mass density.For the sample of 38 millimeters long, the about typically 50-60Hz of resonant frequency, this depends on the biasing field intensity.

Interact by magnetoelasticity, the cycle that the mechanical stress relevant with mechanical vibration produces magnetization J changes its mean value J _HDetermine by bias magnetic field H.The associated change induced electricity magnetic force (emf) of magnetic flux, this electromagnetic force can measure in the magnetic test coil of the 100 closure-couplings of enclosing of having an appointment around the band.

In the EAS system, the magnetic-phonoresponse of concentrator marker is advantageously monitored between the tone pulse that has reduced noise level, therefore for example allows the door (exciting the both sides that place the door of at interval vertical with receiving coil respectively) of broad.This signal is after exciting, and promptly tone pulse is over afterwards with exponential damping.Depend on alloy composition and thermal treatment die-away time, this time can be that the hundreds of microsecond is to several milliseconds.At least about 1 millisecond of sufficiently long die-away time, enough signal evaluations were important between the tone pulse in order to provide.

Therefore, about 1 millisecond of resonance signal wave amplitude of measuring induction after exciting; This resonance signal wave amplitude is referred to as A1 hereinafter.Therefore the high A1 wave amplitude measured as this paper be the good magnetic-phonoresponse and the demonstration of low signal attenuation.

The result

Common EAS concentrator marker uses the single resonance device, and it is to be about 38 millimeters, thick about 25 microns and wide about 12.7 millimeters or 6 millimeters.Embodiment 1 and 2a are two kinds of so common compositions in the Table II, and suitable the EAS magnetic property of using and the performance that resonates.

Significantly, the signal wave amplitude of the resonator of broad is about twice of arrowband.Yet the obvious advantage of arrowband is to allow structure narrower, more the concentrator marker of Qing Xieing.Narrow advantages with wide resonator is got up, and it is special hope that the narrow concentrator marker with high signal wave amplitude promptly is provided.

Common wide resonator and the signal amplitude differences between the narrow resonator material (embodiment 1 and 2a in the Table II) are obviously relevant with the band cross section in each case.As if high cross provide higher resonance signal wave amplitude.

In first test, attempt to cause bigger cross section, to increase the signal wave amplitude of arrowband by increasing tape thickness.This band is annealed in the mode identical with embodiment 2a.This test findings is listed in Table II with embodiment 2a.Although the cross section is bigger, the signal wave amplitude reduces, and this can make an explanation according to the eddy current loss relevant with the larger cross-section band.

In second test, two No. 2 alloy strap registrations are arranged and are constituted double resonator.This band is annealed in the mode identical with embodiment 2a.Therefore, resonance wave amplitude A1 increases (embodiment 2c in the Table II) greatly.The surface characteristics (for example as thin oxide layer) of band has guaranteed the enough electrical isolations between the band, permeates between two bands thereby suppress eddy current.Yet it is more much lower than 12.7 mm wide straps that wave amplitude still is proved to be.And, when bias-field is reduced to 2 oersteds from 6.5 oersteds, frequency shifting Δ F _rReduce only about 1.2 thousand Hz, this is not enough to guarantee the reliable inactivation of concentrator marker.

In another test, change alloy composition by the common cobalt content of forming by reducing in the alloy.6 millimeters bands and previous embodiment are similarly annealed then.Other two 6 millimeters broadbands formation double resonator of putting together.Table III is listed these results (embodiment 3-9), and is the preferred embodiments of the invention.As embodiment, shown resonance performance (wave amplitude in Figure 1A medium frequency and Figure 1B) and the magnetic hysteresis loop (Fig. 2) of embodiment 3, they can compare particularly high signal wave amplitude with the 12.7 mm wide resonators of embodiment 1.Yet what be combined into double resonator allows to use much narrow concentrator marker now than the arrowband.

As what can see, be defined as anisotropy (or knee shape curved) the H of magnetic hysteresis loop near saturated field by Fig. 2 _kIncrease according to following order: H _K(long band)＜H _K(the signal resonators of 38 millimeters long)＜H _K(double resonators of 38 millimeters long).

Fig. 3 A and 3B have illustrated the primary element in the double resonator concentrator marker embodiment that makes up according to the present invention and the structural arrangement of these elements.This invention concentrator marker comprises narrow cover 1, and it is equipped with two resonator sheets 2, and every width is 6 millimeters.First lid 3 of resonator sheet 2 usefulness covers, and places lift magnet 4 on the lid 3.Second lid of lift magnet 4 usefulness and bonding agent 5 cover, and therefore, seal the cover 1 that contains all component.

Fig. 4 A and 4B have shown the basic structure and the assembly of common (wide) magneto-acoustic marker.This common concentrator marker comprises cover 6, its wide resonator sheet 7 that is enough to hold common wide (12.7 millimeters), and this sheet covers with first lid 8.On lid 8, place lift magnet 9, and cover with second lid and bonding agent 10.

The common wide concentrator marker of the concentrator marker of the present invention of Fig. 3 A and 3B and Fig. 4 A and 4B has identical performance, and still, the concentrator marker of the present invention of double resonator has pure and fresh outward appearance and cost advantage because of its width is less.Fig. 3 A and 3B show that also advantageously resonator sheet 2 has cupping transverse curl (typically about 150-320 micron), and the top is towards lift magnet.A kind of like this curl can be adopted suitable annealing fixed equipment anneal (referring to above-mentioned common unsettled U. S. application number 08/968653).

Should replenish, for example use alloy No. 2,, also can reach desired performance by annealing for about 420 ℃ than higher temperature.Because this temperature is not away from upper annealing temperature,,, reduced like this and become fragile and/or the danger of crystallization because of they allow lower annealing temperature (typically 350-380 ℃) so the 3-9 alloy is preferred.

In order to explain above-mentioned discovery, at first should be noted that and to describe resonant frequency F with following formula _rWith bias magnetic field H variation relation: $F_r\left(H\right)=\frac{1}{2L}\sqrt{\frac{E_s/\mathrm{\&rho;}}{1+\frac{9{\mathrm{\&lambda;}}_x^2{E}_s}{J_s{H}_K^3}{\mathrm{<figure-callout\; id="2"\; label="H"\; filenames="A0080356800351.png,A0080356800352.png"\; state="\{\{state\}\}">H</figure-callout>}}^2}}$ λ in the formula _sBe the saturation magnetostriction constant, J _sBe saturation magnetization, E _sBe the Young modulus under the ferromagnetic state of saturation, H _kBe the knee shape curved field of B-H loop, ρ is that mass density and L are resonator lengths.

The parameter of a crucial decision resonator behavior is the knee shape curved of B-H loop.Importantly recognize the knee shape curved field H relevant with above-mentioned relation _kNot only depend on thermal induction anisotropy field (general common view), but also mainly depend on strap geometric configuration (length, width, thickness) and the strap quantity that constitutes the actual resonator assembly.Therefore, H _kCan describe with following formula approx:

H _k=H _A+ pNJ _s/ μ _oH in the formula _ABe thermal induction anisotropy field (the knee shape curved field of the strap record that=basis is very long, H _k), p is the strap number of resonator assembly, and N is single strap demagnetization factor (μ _oBe vacuum infiltration and J _sBe saturation magnetization).

Mass density ρ, Young modulus E _s, saturation magnetostriction constant λ _sWith saturation magnetization J _sDepend primarily on the composition of alloy.Induced anisotropy field H _ADepend on alloy composition and thermal treatment.Because demagnetization effect, effectively resonator knee shape curved field H _kAlso depend on resonator geometric configuration resonator quantity.Therefore, in order to obtain the optimization resonator of EAS concentrator marker, need the good precise combination of a kind of alloy composition, thermal treatment resonator geometric configuration.

Therefore, suitably select the H of given alloy composition _k, for making concentrator marker have desired performance, for example high wave amplitude, in bias-field, all be crucial to the insensitive and good inactivation that fluctuates.H _kThe too high inactivation that for example causes of value is bad, H _kThe too low F that causes of value _rToo big with the slope of bias curve.

As an example, Fig. 5 has illustrated because bias-field departs from about 0.5 oersted of its target value a little, for example owing to orientations different in the magnetic field of the earth, resonant frequency F _rThe characteristic of signal wave amplitude when removing the stimulating frequency of interrogation zone.Black circle 11 expression [dF _r/ dH]=200Hz/Oe, black circle 12 expression [dF _r/ dH]=600Hz/Oe, and black circle 13 expression [dF _r/ dH]=1000Hz/Oe.Can draw [dF by Fig. 5 _r/ dH] slope is too high, and when promptly about 750Hz/Oe was above, the signal wave amplitude reduced more than 50%, greatly reduce access speed (promptly reasonably producing alarm velocity) like this, so concentrator marker had lost its signal homogeneity.

As top discussion result of study, can determine as follows to several conclusions of particularly suitable alloy composition that instruct to select to provide as Table I and III.

H _kThe value that should have about 10 oersteds, this value have guaranteed to occur maximum wave amplitude in the bias-field that is lower than 8 oersteds.The proper property (F when promptly enough low slope and sufficiently high inactivation for the suitable resonator that obtains resonator assembly _rDisplacement), this alloy should have the magnetostriction of about 8-14ppm so.This can use iron content to reach less than the alloy composition of 30 atom %.Iron content should be at least about 15 atom %, so that this material has sufficiently high magnetostriction, so that available magnetic-elastic method excites.

Reach desired H in order to handle (promptly handling several seconds) by typical heat at the about 300-420 of temperature ℃ _kValue, Co and Ni content also must correspondingly be selected.Like this Co and Ni content are limited in the scope that the front brief description provides.Therefore, the double resonator of 6 mm wides for example, the alloy that Co content is higher than 18 atom % produces desired frequency shifting Δ F _rBe worth too for a short time, Co content is less than the frequency slope [dF of the alloy of 6 atom % _r/ dH] too high (too precipitous).

In order to use tension feedback control, anisotropy field should be enough sensitive to applying tension stress during the annealing.Only iron content is exactly this situation less than about 30 atom % or greater than the alloy composition of about 45 atom %.

Also possible is plural resonator sheet to be combined can obtain even higher wave amplitude.In Table IV, provided embodiment.For three or the quadruple resonator, advantageously further reduce the Co content in the alloy.The low like this Co content alloy that is fit to these multiple resonators is not suitable for double resonator.The double resonator of being made by such alloy always shows undesirable high slope, about 1000Hz/Oe, and it is too sensitive that this makes that resonator changes bias-field.

Therefore, one is to recognize with successfully producing two key points relevant with multiple resonator, for the multiple resonator concentrator marker of an optimization, importantly has the total resonator assembly H that effectively determines very much _kValue.Thereby given certain composition needs only H in each case _kBe applicable to actual resonator assembly, no matter use that effectively the Hk value should be always identical with single, two or multiple resonator.Yet, for example, constitute the H of the single strap of this resonator because the double resonator of optimization is arranged _kThan whole assembly little (for example the band of 6 mm wides, little about 2 oersteds) (referring to Fig. 3 A, 3B and 4A, 4B).Therefore, except same material, different (referring to Figure 1A, the 1B) of the magnetic-acoustic performance of the single resonator of making and double resonator.Therefore, usually, the optimization of double resonator annealing amorphous alloy ribbon generally not too is fit to or is not suitable for the single resonance device, and vice versa.

In principle, by different annealing in process, promptly, can optimize the given alloy that is used for single, double or multiple resonator for example by being adjusted in annealing temperature, time and the tension force in when annealing.Yet in practice, changing resonator behavior by annealing can be restricted.In order to ensure good annealing in process, therefore two (many) resonators of optimization should usually need and some different composition of single resonator (supposing that the width of resonator sheet and length are identical) of optimizing.Therefore, compare with the single resonator of optimizing, the double resonator of optimization generally needs the composition that Co content is lower and/or (Si, B, C, Ni) content is higher (although this difference can only be that 1 atom % or 1 atom % are following).

Opposite with above-mentioned US 4 510 490 illustrational common arrangements arranged side by side, Fig. 6,7 and 8 has proved and has adopted multiple resonator sheet registration to place the advantage that is reached.As top pointed, in US 4 510 490 described concentrator markers, use the main reason of two resonators to be, can use in given bias-field, to have the resonator of different resonant frequencies separately, have unique homogeneity to cause concentrator marker.Fig. 6,7 and 8 has proved that it is not the magnetic equivalence with two resonator sheet arrangements arranged side by side that two resonator sheet registrations are placed (on each other).

Fig. 6 has compared and has different-alloy by two kinds and form, and therefore has different resonant frequencies respectively in given bias-field H=6.5 oersted, arranges the signal wave amplitude of the double resonator that rearranges with registration in mode arranged side by side.Alloy number is seen this paper table 1.No. 2 alloy composition in this table is Fe ₂₄Co ₁₈Ni ₄₀Si ₂B ₁₆With No. 3 alloy composition in this table be Fe ₂₄Co _12.5Ni _45.5Si ₂B ₁₆As obviously being shown by Fig. 6, for non-these type resonator of the present invention, every kind all has each different self-resonant frequencies, advantageously places band side by side, because if registration is placed band, then wave amplitude just reduces greatly.

Fig. 7 shows the double resonator that is made of two single resonator sheets, but each sheet carried out optimization when using as single resonator, and corresponding to No. 2 alloys of this paper table 1.This two resonators sheet has the identical resonant frequency of nominal at bias-field H=6.5 oersted.Can be seen by Fig. 7, if these resonator registrations are placed, be not placement arranged side by side, and wave amplitude still reduces greatly.And, can also see that by Fig. 7 band is placed the double resonator that is constituted with registration and demonstrated frequency changes delta F when removing bias magnetic field (when being the concentrator marker inactivation) _rDeficiency has high unfriendly Q in addition.These results come together in following table A1:

Table A 1: No. 2 alloys (prior art and comparative example) of table 1

Resonator types	??A1(mV)	????Q	????F r(kHz)	??[dF r/dH](Hz/Oe)	??ΔF r(kHz)
						Single, No. 1	????84	???505	????57.02	????630	????2.21
Single, No. 2	????87	???495	????57.00	????663	????2.31
						Two, side by side	????154	???628	????57.47	????569	????1.88
Two, each other last	????115	???984	????58.08	????410	????1.32

Fig. 8 has shown the resonator of making according to the principle of the invention, and its performance comes together in following table A2.As can being seen by Fig. 8, because alloy of the present invention and thermal treatment, wave amplitude reduces seldom to have the wave amplitude of the double resonator of two registration resonator sheets to demonstrate just, also reached a good concentrator marker with slope, Δ F _r, other requirement that Q etc. is relevant.In addition, used bias-field H=6.5 oersted.

The result who has shown the resonator sheet among Fig. 6,7 and 8, these sheets all are wide 6 millimeters, long 38 millimeters and thick 25 microns.

No. 3 alloys (embodiment of the invention) of Table A 2 Table I

Resonator types	??A1(mV)	????Q	???F r(kHz)	??[dF r/dH](Hz/Oe)	??ΔF r(kHz)
						Single, No. 1	????75	??223	???55.02	????193	????3.53
Single, No. 2	????75	??223	???55.04	????235	????3.56
						Two, side by side	???176	??301	???55.67	????677	????3.03
Two, each other last	???163	??508	???56.79	????581	????2.09

The special embodiment that is fit to two and single resonance device

Verified as Table II embodiment, to discuss as above-mentioned, if the optimization resonator alloy (referring to embodiment 2) of single resonance device during as two (many) resonators (referring to embodiment 2c), then generally has very poor performance, and vice versa.

Therefore, typically, the optimization alloy band of two (many) resonators, if when the single resonance device, then its slope is [dF approximately _r/ dH]=1000Hz/Oe, this slope is too high.Slope means the sensitivity of resonant frequency to biasing field intensity accidental fluctuation (because lift magnet dispersion and/or concentrator marker are to the orientation in magnetic field of the earth), for a good concentrator marker is unsuitable too high, because resonant frequency provides the concentrator marker with signal homogeneity.

Table V has been listed an embodiment (embodiment 9b), and this table shows the single resonance device performance (referring to Table I, III) that is used for double resonator and optimizes No. 9 alloys of annealing.Slope [the dF of this single resonance device _r/ dH] be near 900Hz/Oe, therefore be higher than acceptable slope significantly.Similarly, Table V has illustrated that triple resonators of sample 10-11 have disadvantageous single resonance device performance (high slope and low wave amplitude).

Though the inventor has found some and the different exception of this vague generalization, but they are limited to specific compositing range and specific thermal treatment, as indicated in 3-8 alloy in the Table I and Table III embodiment 3-8, they all carried out the optimization annealing of double resonator.Illustrated as embodiment 3b, 5b and 7b in the Table V, these specific bands all have the suitable performance as the single resonance device simultaneously, although all carried out the optimization annealing of double resonator.These performances not only can be compared with 6 millimeters single resonance devices of prior art, and even favourable especially because slope [dF _r/ dH] low and frequency shifting Δ F _rHigher.

Much lower slope can improve the coupling speed of concentrator marker, because resonant frequency is insensitive to the bias-field fluctuation.This insensitiveness is equivalent with the identifier with higher wave amplitude and higher slope, and wave amplitude reduces when exciting the AC field frequency because if resonant frequency departs from.In other words, compare (referring to Fig. 5) with the concentrator marker with higher slope, the concentrator marker with low slope has the higher signal wave amplitude, and therefore available inquiry system is monitored better, if stimulating frequency is not strictly to mate with resonant frequency.

The second, much higher Δ F _rProvide even more assurance,, do not have any false alarm if promptly bad because of lift magnet demagnetization imperfection concentrator marker inactivation.

Therefore, these special single resonance devices are than the single resonance device (for example embodiment 2a of Table II) of prior art even be more suitable in concentrator marker.

These special annealed alloy bands (embodiment 3-8 among Table I and the III) can be used for the fact of double resonator identifier and single resonance device identifier, be the another one advantage, because this situation helps the logistic system in producing two class concentrator markers if desired.Therefore the embodiment 3-8 of Table I and III is a highly preferred embodiment of the present invention.

The present invention's point of key in addition is to find to make relevant alloy composition and/or heat treated special selection, so that the narrow amorphous alloy ribbon that is suitable for single resonance device and double resonator is provided.

Fig. 9 has illustrated this discovery.Fig. 9 is as double resonator, and has different saturation magnetostriction constant λ _sTwo kinds of resonant frequency and bias-field curve maps of optimizing annealed alloys.More properly, Fig. 9 has shown single strap, i.e. the resonant frequency curve of single resonance device.Empty perpendicular line is represented the scope by the typical bias-field of magnet 4 (with 9) generation.

For double resonator has identical performance, have than high-magnetostriction (λ _s=15ppm) alloy ratio has than low magnetostriction (λ _s=11ppm) alloy needs higher anisotropy field H _kTherefore, at about 9 oersteds of higher bias-field, the high-magnetostriction alloy is in minimum resonant frequencies, and at low about 7 oersteds of bias-field, lower magnetostriction alloy is in minimum resonant frequencies.

Too high bias-field is because the magnetic pull between lift magnet and the resonator is unaccommodated, and this bias-field causes undesirable clamp, has therefore lost signal.So, be preferred less than the bias-field of about 8 oersteds.

Therefore, in 6-7 oersted typical case bias-field, the slope of high-magnetostriction single resonance device is about 1000Hz/Oe, this is undesirable, and lower magnetostriction alloy has low slightly slope, because magnetic bias field is almost consistent with the resonant frequency curve minimum, promptly with [dF _r/ dH]=0 unanimity.

Therefore, preferably have the alloy composition of saturation magnetostriction less than about 15ppm, if the iron content of alloy less than about 30 atom %, this alloy composition is available.So for example the alloy of the about 24 atom % of iron content typically has the about 10-12ppm of saturation magnetostriction constant, these alloys are suitable for having the minimum resonant frequencies near the about 6-7 oersted of bias-field.

If if why explained bias-field like this is about 6-7 oersted and annealing zone should be fit to the double resonator concentrator marker simultaneously the time, No. 9 alloys (27at%Fe, λ _s=13ppm) owing to its higher magnetostriction, than 3-8 alloy (24at%Fe, λ _s=11-12ppm) more be not suitable for use in the reason of single resonance device.Correspondingly, this situation because of higher magnetostrictive alloy (referring to alloy 10-12, λ _s＞20ppm) become more bad, if this moment multiple resonator the optimization band when the single resonance device, slope far surpasses 1000Hz/Oe, its wave amplitude is also low.

Therefore, for the annealed alloy band that is suitable for double resonator and single resonance device, some governing principles that obtained by above-mentioned result of study are as follows.

It should almost be consistent with the magnetic bias field that is produced by lift magnet that single resonance device resonant frequency has the bias-field of minimum value, and this lift magnet typically should be less than about 8 oersteds, preferably about 6-7 oersted.Side by side, double resonator wave amplitude A1 has peaked bias-field that this bias-field of minimum value should be arranged near single resonance device resonant frequency.

Therefore, annealing in process must so be selected, so that the knee shape curved field H of single resonance device _k(promptly high about 10-30%) is higher than the bias-field that applies a little.This can carry out alloy annealing under the following conditions and reach: in the presence of basic and magnetic field that tape spool is vertical orientated, and the about 300-400 of temperature ℃, time in several seconds, and randomly apply tension stress simultaneously up to about 200 MPas.The magnetic field that applies also should be vertical orientated with the band plane substantially, and annealing has produced the thin regional structure of crossing the bandwidth orientation like this, and the average area width is less than (roughly) tape thickness.

Alloy composition must so be selected, so that the anisotropy field of induction can produce the suitable resonator behavior of double resonator.

Can reach these performances by the alloy composition of for example selecting to have the approaching about 10-12ppm of magnetostriction.By to select iron content be about 22-26 atom %, cobalt content for about 8-14 atom %, nickel content be that the Fe-Co-Ni-Si-B alloy that element (Si, B, C, Nb, the Mo etc.) total content of about 44-52 atom % and generation glass is at least about 15-20 atom % reaches these performances.A kind of so special selection is preferred for the concentrator marker in the about 6-7 oersted operation of bias-field.

If concentrator marker is when the bias-field operation that is lower than 6 oersteds, magnetostriction has to further reduce, and composition is had to so adjusted, and for example iron content is reduced to the about 15 atom % of lower limit of permission., or not the slope of double resonator itself Δ F if must further reducing _rThe time, this modification also is necessary, above-mentioned slope reduces can be taked to make double resonator to be biased in its minimum resonant frequency place to reach.Although under latter event, may lose as the applicability of single resonance device simultaneously, but a kind of like this advantage that has the alternation double resonator than the low magnetostriction alloy to provide is, the frequency sensitivity of bias-field fluctuation is reduced, and also be another embodiment of the present invention.

Be noted that and be crucial to be issued to very high wave amplitude level in minimum resonant frequencies with the vertical annealing in plane.It also improves the maximum amplitude level and reaches at least about 10-20%.Common transverse field annealed material has the signal wave amplitude that almost suddenly disappears in the bias-field of resonant frequency minimum, therefore is not suitable for these the preferred embodiments of the invention.Figure 10 has illustrated this situation.

If do not need to be applicable to simultaneously single resonance device and double resonator, vertical field annealing is preferred selection, but optional.The scope of alloy composition is somewhat wide then, but iron content also should be lower than about 30 atom %, is positioned at moderate bias level in order that guarantee maximum signal wave amplitude, and the bias-field that consequently is lower than about 8 oersteds can produce sufficiently high signal wave amplitude.

Table

The symbol of table:

H _kThe anisotropy field of resonator assembly

A1 is at the resonator wave amplitude of 6.5 oersted bias-field

[dF _r/ dH] be slope, i.e. resonant frequency F _rSensitivity to bias-field (being in these embodiments) variation at 6.5 oersteds

Δ F _rBe frequency shifting, i.e. resonant frequency poor between 2-6.5 oersted bias-field, it is the tolerance of the required frequency change of a kind of concentrator marker inactivation

Table I: the alloy composition of test.J _sBe saturation magnetization, λ _sIt is saturation magnetostriction

Constant

Alloy number	Form atom %					????J s????(T)	????λ s????(ppm)
								????Fe	????Co	????Ni	????Si	????B
	????1	????24	????16	???42.5	???1.5								????16	????0.93	????11.7
????2						????24	????18	????40	????2	????16	????0.95	????11.7
	????3	????24	???12.5	???45.5	????2								????16	????0.86	????11.4
????4						????24	???12.5	???44.5	????2	????17	????0.84	????11.0
	????5	????24	????13	???45.5	???1.5								????16	????0.89	????11.4
????6						????24	????12	???46.5	???1.5	????16	????0.87	????11.2
	????7	????24	???11.5	????47	???1.5								????16	????0.88	????11.3
????8						????24	????11	????48	????1	????16	????0.88	????11.4
	????9	????27	????10	????45	????2								????16	????0.91	????12.9
????10						????46	????2	????35	????1	????16	????1.22	????24.2
	????11	????51	????2	????30	????1								????16	????1.32	????28.0
????12						????53	????0	????30	????1	????16	????1.33	????28.6

Table II

Existing technology status (embodiment 1 and 2a) and comparative example.(representational annealing parameter: in annealing temperature about 390 ℃ of following several seconds, tension stress is about 80-120 MPa)

Embodiment	Alloy number	Type	Width (mm)	Thickness (μ m)	????H K???(Oe)	????A1 ???(mV)	????[dF r/dH] ????(Hz/Oe)	???ΔF r???(kHz)
									????1	????1	Single	??12.7	????25	???10.5	????165	????601	????2.08
????2a	????2	Single	????6	????25	???10.5	????85	????605	????2.11
									????2b	????2	Single	????6	????40	???11.7	????67	????466	????1.63
????2c	????2	Two	????6	????25	???12.3	????107	????317	????1.21

Table III

Embodiments of the invention, double resonator wide 6 millimeters, thick 25 microns and long 40 millimeters.

(typical annealing parameter: in the about 350-390 of annealing temperature ℃ following several seconds, tension stress is about 80-120 MPa)

Embodiment	Alloy number	Type	????H K????(Oe)	????A1 ????(mV)	??[dF r/dH] ??(Hz/Oe)	??ΔF r(kHz)
							????3	????3	Two	????9.9	????167	????622	????2.32
????4	????4	Two	???10.0	????160	????581	????2.15
							????5	????5	Two	????9.5	????162	????597	????2.17
????6	????6	Two	????9.6	????158	????629	????2.24
							????7	????7	Two	????9.9	????166	????620	????2.21
????8	????8	Two	???10.0	????150	????555	????1.98
							????9	????9	Two	???10.5	????161	????667	????2.30

Table IV

Embodiments of the invention, multiple (＞2) resonator wide 6 millimeters, thick 25 microns and long 35-40 millimeter.

(typical annealing parameter: in the about 350-390 of annealing temperature ℃ following about 6 seconds, tension stress is about 80-120 MPa)

Embodiment	Alloy number	Type	????H K????(Oe)	????A1 ???(mV)	??[dF r/dH] ??(Hz/Oe)	?ΔF r(kHz)
							????10	????10	Three	???15.2	???181	????597	????1.90
????11	????11	Three	???16.3	???191	????599	????1.99
							????12	????12	???4	???17.8	???212	????515	????1.89

Table V:

The typical resonator performance of single resonance device (referring to Table III and IV embodiment), this single resonance device uses the optimization material of two (or multiple) resonators

Embodiment	Alloy number	Type	????H K???(Oe)	????A1 ???(mV)	??[dF r/dH] ??(Hz/Oe)	???ΔF r(kHz)
							????3b	????3	Single	????8.0	????78	????214	?????3.73
????5b	????5	Single	????7.7	????72	????281	?????3.46
							????7b	????7	Single	????7.8	????70	????42	?????3.61
????9b	????9	Single	????8.7	????83	????894	?????3.90
							???10b	????10	Single	???11.4	????49	????1386	?????5.52
???11b	????11	Single	???12.4	????55	????1448	?????5.80

Although concerning the various changes of the present described preferred embodiment of this paper with revise for being conspicuous, such change the those skilled in the art and revising and not exceed the spirit and scope of the present invention and can not reduce under the condition of its thing followed advantage and carry out.Therefore, claims are intended to cover such change and modification.

Claims (49)

1, a kind of in magnetic mechanical electron device surveillance, the production method of the resonator that in the concentrator marker that the biasing element that produces bias magnetic field is housed, uses, described method comprises the steps:

The plane that comprises a kind of alloy ferromagnetic tape is provided, and the iron content of its alloy is at least about 15 atom %, and described ferromagnetic tape has along the tape spool of the length direction elongation of ferromagnetic tape;

The annealing of described ferromagnetic tape, and allow described ferromagnetic tape be subjected to the vertical orientated magnetic field of at least one and described tape spool and the effect of the tension stress that applies along described tape spool, with the ferromagnetic tape that obtains annealing;

Downcut sheet from described ferromagnetic tape, these sheets have essentially identical length and essentially identical width respectively, described resonant frequency that has in described ± 500Hz magnetic field separately; And

At least two described registrations are placed to constitute multiple resonator.

2, method according to claim 1 wherein provides plane ferromagnetic tape step to comprise to provide cobalt content less than about 18 atom % and the nickel content ferromagnetic tape at least about 25 atom %.

3, method according to claim 1 wherein saidly ferromagneticly has the band plane that comprises described tape spool, and wherein said ferromagnetic tape annealing steps is included in and makes described ferromagnetic tape annealing in the magnetic field with fundametal component vertical with described plane.

4, method according to claim 3, wherein said ferromagnetic tape annealing steps comprises, the fundametal component vertical except described and described plane, also have at neutralization of described plane and the horizontal component of described tape spool, with along making described ferromagnetic tape annealing in the magnetic field of the minimum component of described ferromagnetic tape, so that in described ferromagnetic tape, produce and the thin regional structure of the rule of described tape spool horizontal orientation.

5, method according to claim 1, wherein said ferromagnetic tape annealing steps comprises, in intensity at least about 800 oersteds, apply tensile strength in the magnetic field of about 50-150 MPa toward described ferromagnetic tape simultaneously, with the about 15-50 rice of the annealing speed of described ferromagnetic tape/minute, and make the annealing of described ferromagnetic tape under the about 300-400 of annealing temperature ℃ the condition.

6, method according to claim 5, wherein said ferromagnetic tape annealing steps are included in and make described ferromagnetic tape annealing in the magnetic field of intensity at least about 2000 oersteds.

7, method according to claim 1, wherein said ferromagnetic tape annealing steps comprises makes described ferromagnetic tape annealing, being created in the magnetic hysteresis loop in described, when described annealing ferromagnetic tape downcut, its magnetic hysteresis loop all was linear up to described alloy by ferromagnetic saturated magnetic field.

8, method according to claim 1, wherein said ferromagnetic tape has certain tape thickness, wherein said ferromagnetic tape annealing steps comprises makes described ferromagnetic tape annealing, so that produce thin regional structure in described ferromagnetic tape, the peak width of this structure is less than described tape thickness.

9, method according to claim 1, this method comprises the composition of selecting described alloy, is about 8-14ppm so that produce saturation magnetostriction in each described, the anisotropy field H of described multiple resonator _kBe about 8-12 oersted.

10, method according to claim 9, this method comprise the described composition of selecting described alloy, so that make described multiple resonator have stable resonant frequency F _r, [dF wherein _r/ dH]＜750Hz/Oe, wherein H is described bias magnetic field, F when wherein removing described bias magnetic field _rBe changed to 1.6kHz.

11, method according to claim 1 wherein provides plane ferromagnetic tape step to comprise amorphous band is provided, and the composition of this band is Fe _aCo _bNi _cSi _xB _yM _z, a, b, c, x, y and z represent with atom % in the formula, wherein M is the glass generation promotion element of at least a C of being selected from, P, Ge, Nb, Ta and Mo, and/or at least a transitional element that is selected from Cr and Mn, and wherein

15≤a≤30

6≤b≤18

27≤c≤55

0≤x≤10

10≤y≤25

0≤z≤5

14≤x＋y＋z≤25

And a+b+c+x+y+z=100.

12, method according to claim 11, wherein providing plane ferromagnetic tape step to comprise provides described plane amorphous band, wherein:

20≤a≤28

6≤b≤14

40≤c≤55

0.5≤x≤5

12≤y≤18

0≤z≤2

15≤x＋y＋z≤20。

13, method according to claim 1, wherein the step from described annealing ferromagnetic tape section comprises from described ferromagnetic tape section, the about 4-8 millimeter of every width, the about 35-40 millimeter of length, and thickness is about 20-30 micron.

14, method according to claim 13 wherein provides plane ferromagnetic tape step to comprise the amorphous iron tape is provided, and its band has the composition that is selected from following composition:

Fe ₂₂Co ₁₀Ni ₅₀Si ₂B ₁₆, Fe ₂₂Co _12.5Ni _47.5Si ₂B ₁₆, Fe ₂₄Co ₁₃Ni _45.5Si _1.5B ₁₆, F ₂₄Co _12.5Ni _45.5Si _1.5B ₁₇, Fe ₂₄Co _12.5Ni _45.5Si ₂B ₁₆, Fe ₂₄Co _12.5Ni _44.5Si ₂B ₁₇, Fe ₂₄Co _12.5Ni ₄₅Si ₂B ₁₆, Fe ₂₄Co _12.5Ni ₄₅Si _2.5B ₁₆, Fe ₂₄Co _11.5Ni ₄₇Si _1.5B ₁₆, Fe ₂₄Co _11.5Ni _46.5Si _1.5B _16.5, Fe ₂₄Co _11.5Ni _46.5Si ₂B ₁₆, Fe ₂₄Co _11.5Ni _46.5Si _2.5B _15.5, Fe ₂₄Co ₁₁Ni ₄₇Si ₁B ₁₆, Fe ₂₄Co _10.5Ni ₄₈Si ₂B _15.5, Fe ₂₄Co _9.5Ni _49.5Si _1.5B _15.5, Fe ₂₄Co _8.5Ni ₅₁Si ₁B _15.5, Fe ₂₅Co ₁₀Ni ₄₇Si ₂B ₁₆And Fe ₂₇Co ₁₀Ni ₄₅Si ₂B ₁₆

15, method according to claim 13, wherein providing plane ferromagnetic tape step to comprise provides the plane ferromagnetic amorphous band, and it has the composition of following formula:

Fe _24-rCo _12.5-wNi _45+r+v+1.5wSi _2+uB _{16.5-u-v-0.5w}R=-4 to 4 atom % in the formula, u=-1 to 1 atom %, v=-1 to 1 atom % and w=-1 to 4 atom %.

16, method according to claim 1, wherein comprise and downcut a plurality of continuous sheets from described ferromagnetic tape along described tape spool from the step of described annealing ferromagnetic tape section, wherein at least two described registrations are placed the sheet registration placement that step comprises at least two described continuous cutting-outs, to constitute described multiple resonator.

17, method according to claim 1, wherein the step of at least two described registration placements comprises at least three described configuration placement, and wherein providing plane ferromagnetic tape step to comprise provides the plane amorphous band, and the composition of this band is Fe _aCo _bNi _cSi _xB _yM _z, a, b, c, x, y and z represent with atom % in the formula, wherein M is the promotion glass generting element of at least a C of being selected from, P, Ge, Nb, Ta and Mo, and/or at least a transitional element that is selected from Cr and Mn, wherein:

30≤a≤65

0≤b≤6

25≤c≤50

0≤x≤10

10≤y≤25

0≤z≤5

15≤x＋y＋z≤25

And a+b+c+x+y+z=100.

18, method according to claim 17, wherein providing plane ferromagnetic tape step to comprise provides the plane amorphous band, wherein

45≤a≤65

0≤b≤6

25≤c≤50

0≤x≤10

10≤y≤25

0≤z≤5

15≤x＋y＋z≤25。

19, method according to claim 17, wherein cutting described step from described annealing ferromagnetic tape comprises from described ferromagnetic tape and downcuts sheet, about 6 millimeters of the width of each sheet, the about 35-40 millimeter of length wherein provides the step of the amorphous band in plane to comprise providing to have composition Fe ₄₆Co ₂Ni ₃₅Si ₁B _15.5C _0.5The amorphous band in plane.

20, method according to claim 17, wherein cutting described step from described annealing ferromagnetic tape comprises from described ferromagnetic tape and downcuts sheet, about 6 millimeters of the width of each sheet, the about 35-40 millimeter of length wherein provides the amorphous band step in plane to comprise providing and has composition Fe ₅₁Co ₂Ni ₃₀Si ₁B _15.5C _0.5The amorphous band in plane.

21, method according to claim 1, wherein at least two described registrations placement steps comprise four described registrations placements, so that constitute described multiple resonator, wherein provide plane ferromagnetic tape step to comprise and provide to have composition Fe ₅₃Ni ₃₀Si ₁B _15.5C _0.5The amorphous band in plane.

22, a kind of in magnetic mechanical electron device surveillance, the production method of the resonator that in the concentrator marker that the biasing element that produces bias magnetic field is housed, uses, described method comprises the steps:

Provide the plane ferromagnetic amorphous band, this band has along the tape spool of the length direction elongation of described ferromagnetic amorphous band, also has composition Fe _aCo _bNi _cSi _xB _yM _z, a, b, c, x, y and z represent with atom % in the formula, wherein M is the promotion glass generting element of at least a C of being selected from, P, Ge, Nb, Ta and Mo, and/or at least a transitional element that is selected from Cr and Mn, and wherein

22≤a≤26

8≤b≤14

44≤c≤52

0.5≤x≤5

12≤y≤18

0≤z≤2

15≤x＋y＋z≤20

And a+b+c+x+y+z=100,

Described ferromagnetic amorphous band annealing allows described ferromagnetic amorphous band be subjected to the vertical orientated magnetic field of at least one and described tape spool and the effect of the tension stress that applies along described tape spool, with the ferromagnetic amorphous band that obtains annealing simultaneously;

From described ferromagnetic amorphous band section, these sheets have essentially identical length and essentially identical width respectively, described resonant frequency that has in described ± 500Hz magnetic field separately; And

The a plurality of described registration that is selected from a slice and two placed to constitute resonator.

23, method according to claim 22, wherein the step from the ferromagnetic amorphous band section of described annealing comprises from the ferromagnetic amorphous band cutting-out sheet of described annealing, the about 4-8 millimeter of every width, the about 35-40 millimeter of length.

24, method according to claim 23, wherein providing the ferromagnetic amorphous band step in plane to comprise provides the plane ferromagnetic amorphous band, and its band has the composition that is selected from following composition:

Fe ₂₄Co ₁₃Ni _45.5Si _1.5B ₁₆, Fe ₂₄Co _12.5Ni ₄₅Si _1.5B ₁₇, Fe ₂₄Co _12.5N _45.5Si ₂B ₁₆, Fe ₂₄Co _12.5N _44.5Si ₂B ₁₇, Fe ₂₄Co _12.5Ni ₄₅Si ₂B _16.5, Fe ₂₄Co _12.5Ni ₄₅Si _12.5B ₁₆, Fe ₂₄Co _11.5Ni ₄₇Si _1.5B ₁₆, Fe ₂₄Co _11.5Ni _46.5Si _1.5B _16.5, Fe ₂₄Co _11.5Ni _46.5Si ₂B ₁₆, Fe ₂₄Co _11.5Ni _46.5Si _2.5B _15.5, Fe ₂₄Co ₁₁Ni ₄₇Si ₁B ₁₆, Fe ₂₄Co _10.5Ni ₄₈Si ₂B _15.5, Fe ₂₄Co _9.5Ni _49.5Si _1.5B _15.5, Fe ₂₄Co _8.5Ni ₅₁Si ₁B _15.5And Fe ₂₅Co ₁₀Ni ₄₇Si ₂B ₁₆

25, method according to claim 23, wherein providing the ferromagnetic amorphous band step in plane to comprise provides the plane ferromagnetic amorphous band, and it comprises the alloy with following formula:

Fe _24-rCo _12.5-wNi _45+r+v+1.5wSi _2+uB _{16.5-u-v-0.5w}R=-1 to 1 atom % in the formula, u=-1 to 1 atom %, v=-1 to 1 atom % and w=-1 to 4 atom %.

26, a kind of in magnetic mechanical electron device surveillance, as in the concentrator marker that the biasing element that produces bias magnetic field is housed, to use resonator, described resonator comprises:

At least two ferromagnetic elements that registration is placed, each element has certain-length and certain width, the width separately of described at least two ferromagnetic elements equates basically, the length separately of described at least two ferromagnetic elements equates basically, each element of described at least two ferromagnetic elements has tape spool vertical with the plane or that be orientated in the plane, this plane has described width and has certain thickness;

Each described ferromagnetic element, they comprise the alloy of iron content at least about 15 atom %;

All described ferromagnetic elements, they have separately resonant frequency, all are linear magnetic hysteresis loops by ferromagnetic saturated magnetic field and have thin regional structure less than the peak width of described tape thickness up to described alloy in described ± 500Hz magnetic field.

27, resonator according to claim 26, wherein each described ferromagnetic element comprises cobalt content less than 18 atom % and the nickel content alloy at least about 25 atom %.

28, multiple resonator according to claim 26, wherein the saturation magnetostriction of each described ferromagnetic element is about 8-14ppm, the anisotropy field H of wherein said multi-resmator _kBe about 8-12 oersted.

29, multiple resonator according to claim 26, it has stable resonant frequency F _r, [dF wherein _r/ dH]＜750Hz/Oe, wherein H is described bias magnetic field, and F when wherein removing described bias magnetic field _rBe changed to 1.6kHz.

30, multiple resonator according to claim 26, wherein each described ferromagnetic element comprises provides amorphous band, and the composition of this band is Fe _aCo _bNi _cSi _xB _yM _z, a, b, c, x, y and z represent with atom % in the formula, wherein M is the promotion glass generting element of at least a C of being selected from, P, Ge, Nb, Ta and Mo, and/or at least a transitional element that is selected from Cr and Mn, and wherein

15≤a≤30

6≤b≤18

27≤c≤55

0≤x≤10

10≤y≤25

0≤z≤5

14≤x＋y＋z≤25

And a+b+c+x+y+z=100.

31, multiple resonator according to claim 30, wherein each amorphous element in described plane comprises amorphous element, wherein:

20≤a≤28

6≤b≤14

40≤c≤55

0.5≤x≤5

12≤y≤18

0≤z≤2

15≤x＋y＋z≤20。

32, multiple resonator according to claim 26, the about 4-8 millimeter of the described width of each described ferromagnetic element wherein, along the about 35-40 millimeter of the length of described element axle, and described thickness is about 20-30 micron.

33, multiple resonator according to claim 26, wherein each described ferromagnetic element has the composition that is selected from following composition:

Fe ₂₂Co ₁₀Ni ₅₀Si ₂B ₁₆, Fe ₂₂Co _12.5Ni _47.5Si ₂B ₁₆, Fe ₂₄Co ₁₃Ni _45.5Si _1.5B ₁₆, Fe ₂₄Co _12.5Ni _45.5Si _1.5B ₁₇, Fe ₂₄Co _12.5Ni _45.5Si ₂B ₁₆, Fe ₂₄Co _12.5Ni _44.5Si ₂B ₁₇, Fe ₂₄Co _12.5Ni ₄₅Si ₂B ₁₆, Fe ₂₄Co _12.5Ni ₄₅Si _2.5B ₁₆, Fe ₂₄Co _11.5Ni ₄₇Si _1.5B ₁₆, Fe ₂₄Co _11.5Ni _46.5Si _1.5B _16.5, Fe ₂₄Co _11.5Ni _46.5Si ₂B ₁₆, Fe ₂₄Co _11.5Ni _46.5Si _2.5B _15.5, Fe ₂₄Co ₁₁Ni ₄₇Si ₁B ₁₆, Fe ₂₄Co _10.5Ni ₄₈Si ₂B _15.5, Fe ₂₄Co _9.5Ni _49.5Si _1.5B _15.5, Fe ₂₄Co _8.5Ni ₅₁Si ₁B _15.5, Fe ₂₅Co ₁₀Ni ₄₇Si ₂B ₁₆And Fe ₂₇Co ₁₀Ni ₄₅Si ₂B ₁₆

34, multiple resonator according to claim 26, wherein each described ferromagnetic element has the composition of following formula:

Fe _24-rCo _12.5-wNi _45+r+v+1.5wSi _2+uB _{16.5-u-v-0.5w}R=-4 to 4 atom % in the formula, u=-1 to 1 atom %, v=-1 to 1 atom % and w=-1 to 4 atom %.

35, multiple resonator according to claim 32, wherein each described ferromagnetic element has the composition that is selected from following composition:

Fe ₂₄Co ₁₃Ni _45.5Si _1.5B ₁₆、Fe ₂₄Co _12.5Ni ₄₅Si _1.5B ₁₇、Fe ₂₄Co _12.5Ni ₄₅Si ₂B ₁₆、Fe ₂₄Co _12.5Ni _44.5Si ₂B ₁₇、Fe ₂₄Co _12.5Ni ₄₅Si ₂B _16.5、Fe ₂₄Co _12.5Ni ₄₅Si _2.5B ₁₆、Fe ₂₄Co _11.5Ni ₄₇Si _1.5B ₁₆、Fe ₂₄Co _11.5Ni _46.5Si _1.5B _16.5、Fe ₂₄Co _11.5Ni _46.5Si ₂B ₁₆、Fe ₂₄Co _11.5Ni _46.5Si _2.5B _15.5、Fe ₂₄Co ₁₁Ni ₄₇Si ₁B ₁₆、Fe ₂₄Co _10.5Ni ₄₈Si ₂B _15.5、Fe ₂₄Co _9.5Ni _49.5Si _1.5B _15.5、Fe ₂₄Co _8.5Ni ₅₁Si ₁B _15.5、Fe ₂₅Co ₁₀Ni ₄₇Si ₂B ₁₆。

36, multiple resonator according to claim 32, wherein each described ferromagnetic element has the composition of following formula:

Fe _24-rCo _12.5-wNi _45+r+v+1.5wSi _2+uB _{16.5-u-v-0.5w}R=-1 to 1 atom % in the formula, u=-1 to 1 atom %, v=-1 to 1 atom % and w=-1 to 4 atom %.

37, multiple resonator according to claim 26, it comprises two and two described registration element only.

38, multiple resonator according to claim 26, it comprises at least three described registration element, wherein the composition of each described ferromagnetic element is Fe _aCo _bNi _cSi _xB _yM _z, a, b, c, x, y and z represent with at% in the formula, wherein M is the promotion glass generting element of at least a C of being selected from, P, Ge, Nb, Ta and Mo, and/or at least a transitional element that is selected from Cr and Mn, and wherein

30≤a≤65

0≤b≤6

25≤c≤50

0≤x≤10

10≤y≤25

0≤z≤5

15≤x＋y＋z≤25

And a+b+c+x+y+z=100.

39, according to the described multiple resonator of claim 38, wherein each described ferromagnetic element comprises amorphous element, wherein:

45≤a≤65

0≤b≤6

25≤c≤50

0≤x≤10

10≤y≤25

0≤z≤5

15≤x＋y＋z≤25。

40, according to the described multiple resonator of claim 38, it comprises three and three described ferromagnetic elements only, and wherein the width of each described amorphous element is about 6 millimeters, the about 35-40 millimeter of length, and wherein each described amorphous element has composition Fe ₄₆Co ₂Ni ₃₅Si ₁B _15.5C _0.5

41, according to the described multiple resonator of claim 38, it comprises three and three described ferromagnetic elements only, and wherein the width of each described amorphous element is about 6 millimeters, the about 35-40 millimeter of length, and wherein each described amorphous element has composition Fe ₅₁Co ₂Ni ₃₀Si ₁B _15.5C _0.5

42, multiple resonator according to claim 26, it comprises four and four described ferromagnetic registration element only, wherein each described amorphous element comprises having composition Fe ₅₃Ni ₃₀Si ₁B _15.5C _0.5Amorphous element.

43, a kind of in magnetic mechanical electron device surveillance, as in the concentrator marker that the biasing element that produces bias magnetic field is housed, to use dual resonator, described resonator comprises:

Two and the ferromagnetic elements placed of two registrations only, each element of described two ferromagnetic elements has certain width and certain-length, the width separately of described two ferromagnetic elements is basic equating, the length separately of described two ferromagnetic elements is basic equating, each element of described two ferromagnetic elements has tape spool vertical with the plane or that be orientated in the plane, this plane has described width, and each element of described two ferromagnetic elements has certain thickness;

Each element of described two ferromagnetic elements, they have composition Fe _aCo _bNi _cSi _xB _yM _z, a, b, c, x, y and z represent with atom % in the formula, wherein M is the promotion glass generting element of at least a C of being selected from, P, Ge, Nb, Ta and Mo, and/or at least a transitional element that is selected from Cr and Mn, and wherein

22≤a≤26

8≤b≤14

44≤c≤52

0.5≤x≤5

12≤y≤18

0≤z≤2

15≤x＋y＋z≤20

And a+b+c+x+y+z=100,

All described ferromagnetic elements, they have separately resonant frequency, all are linear magnetic hysteresis loops by ferromagnetic saturated magnetic field and have thin regional structure less than the peak width of described tape thickness up to described alloy in described ± 500Hz magnetic field.

44, according to the described multiple resonator of claim 43, wherein each described ferromagnetic element has the about 4-8 millimeter of described width, and along the about 35-40 millimeter of the length of described element axle, and described thickness is about 20-30 micron.

45, according to the described multiple resonator of claim 44, wherein each described ferromagnetic element has the composition that is selected from following composition:

Fe ₂₄Co ₁₃Ni _45.5Si _1.5B ₁₆、Fe ₂₄Co _12.5Ni ₄₅Si _1.5B ₁₇、Fe ₂₄Co _12.5Ni ₄₅Si ₂B ₁₆、Fe ₂₄Co _12.5Ni _44.5Si ₂B ₁₇、Fe ₂₄Co _12.5Ni ₄₅Si ₂B _16.5、Fe ₂₄Co _12.5Ni ₄₅Si _2.5B ₁₆、Fe ₂₄Co _11.5Ni ₄₇Si _1.5B ₁₆、Fe ₂₄Co _11.5Ni _46.5Si _1.5B _16.5、Fe ₂₄Co _11.5Ni _46.5Si ₂B ₁₆、Fe ₂₄Co _11.5Ni _46.5Si _2.5B _15.5、Fe ₂₄Co ₁₁Ni ₄₇Si ₁B ₁₆、Fe ₂₄Co _10.5Ni ₄₈Si ₂B _15.5、Fe ₂₄Co _9.5Ni _49.5Si _1.5B _15.5、Fe ₂₄Co _8.5Ni ₅₁Si ₁B _15.5、Fe ₂₅Co ₁₀Ni ₄₇Si ₂B ₁₆。

46, according to the described multiple resonator of claim 44, wherein each described ferromagnetic element has the composition of following formula:

Fe _24-rCo _12.5-wNi _45+r+v+1.5wSi _2+uB _{16.5-u-v-0.5w}R=-1 to 1 atom % in the formula, u=-1 to 1 atom %, v=-1 to 1 atom % and w=-1 to 4 atom %.

47, a kind of in magnetic mechanical electron device surveillance, as in the concentrator marker that the biasing element that produces bias magnetic field is housed, to use single resonance device, described resonator comprises:

Single ferromagnetic element, it has less than about 13 millimeters width, and with tape spool vertical with the plane or that be orientated in the plane, this plane has described width, and has certain thickness;

Described single ferromagnetic element, it has composition Fe _aCo _bNi _cSi _xB _yM _z, a, b, c, x, y and z represent with at% in the formula, wherein M is the promotion glass generting element of at least a C of being selected from, P, Ge, Nb, Ta and Mo, and/or at least a transitional element that is selected from Cr and Mn, and wherein

22≤a≤26

8≤b≤14

44≤c≤52

0.5≤x≤5

12≤y≤18

0≤z≤2

15≤x＋y＋z≤20

And a+b+c+x+y+z=100,

Described single ferromagnetic element has separately resonant frequency in described ± 500Hz magnetic field, all be linear magnetic hysteresis loop up to described alloy by ferromagnetic saturated magnetic field, and have thin regional structure less than the peak width of described tape thickness.

48, according to the described method of claim 47, wherein providing the ferromagnetic amorphous band step in plane to comprise provides the plane ferromagnetic amorphous band, and this band has the composition that is selected from following composition:

Fe ₂₄Co ₁₃Ni _45.5Si _1.5B ₁₆、Fe ₂₄Co _12.5Ni ₄₅Si _1.5B ₁₇、Fe ₂₄Co _12.5Ni ₄₅Si ₂B ₁₆、Fe ₂₄Co _12.5Ni _44.5Si ₂B ₁₇、Fe ₂₄Co _12.5Ni ₄₅Si ₂B _16.5、Fe ₂₄Co _12.5Ni ₄₅Si _2.5B ₁₆、Fe ₂₄Co _11.5Ni ₄₇Si _1.5B ₁₆、Fe ₂₄Co _11.5Ni _46.5Si _1.5B _16.5、Fe ₂₄Co _11.5Ni _46.5Si ₂B ₁₆、Fe ₂₄Co _11.5Ni _46.5Si _2.5B _15.5、Fe ₂₄Co ₁₁Ni ₄₇Si ₁B ₁₆、Fe ₂₄Co _10.5Ni ₄₈Si ₂B _15.5、Fe ₂₄Co _9.5Ni _49.5Si _1.5B _15.5、Fe ₂₄Co _8.5Ni ₅₁Si ₁B _15.5、Fe ₂₅Co ₁₀Ni ₄₇Si ₂B ₁₆。

49, according to the described method of claim 47, wherein providing the ferromagnetic amorphous band step in plane to comprise provides the plane ferromagnetic amorphous band, and this band comprises the alloy with following formula:

F _E24-rCo _12.5-wNi _45+r+v+1.5wSi _2+uB _{16.5-u-v-0.5w}R=-1 to 1 atom % in the formula, u=-1 to 1 atom %, v=-1 to 1 atom % and w=-1 to 4 atom %.

Images